Transient tachypnea of the newborn (TTN) is a diagnosis given to infants born between 34 and 42 weeks gestation who develop difficulty breathing during the first days of life when no specific cause of the breathing difficulty can be identified. Little is known about why some babies develop TTN, and there have not been many formal studies of the best way to take care of babies with this disease. Babies with TTN get better on their own within three to five days after birth, but may require extra oxygen to breath well.